Improvement in saw-fviills



Improvement in Saw` Mills;

V124,524,Pammd'wuirch12,1872;.

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N0', 1.245524, Pate'ntedMarch 112, 1872.

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FFICE.

SAMUEL WEYMOUTH, OF WILLAMSPORT, ASSIGNOR TO H. F. SNYDER AND G. S.SNYDER, OF SAME PLACE, AND ANTES SNYDER, OF FREEPORT, PA.

IMPROVEMENT in saw-MILLS.

To all whom it may concern:

Be it known that I, SAMUELWEYMOUTH, of NVilliamsport, in the county ot'Lycoming, State of Pennsylvania, have invented certain new and usefulImprovements in Saw-Mills, of which the following is aspecilication:

The invention relates to reciprocating sawmills, and more especiallythose in which many. saws are mounted side by side, known as gangsawmills. It consists of improvements in various parts of the framing1 andthe mounting of the rolls which transport the log.

The following isa description of what I consider the best means ofcarrying out the invention. The accompanying drawing forms a part otlthis speciiication.

Figurel is a sideelevation of the mill, showing the series ofsupporting-rolls in position, but with thet'ramin g therefor omitted;a-nd Fi g. 2 is a front elevation. The scale ofthe above isthree-eighths inch to one foot. The remainin g tigures show, on alargerscale, the hinges which connect and disconnect the binder rolli'ranies.and the upright rods on which they are guided. Fig. is an elevation;Fig. 4, an end view; and Fig. 5, a plan view. The scale Ot' these isone-halt' size.

Similar letters of reference indicate like parts in all the igures. Thedrawing represents the novel parts, with so much of the' ordinary partsas is necessary to indicate their relations thereto.

A A are upright `trames, of castiron, and A1 A1` are later-.llframe-pieces, ot' the same lnaterial, rigidly iixed thereto in thepositions represented. They support the entire structure on the postsA2. The feed-rollers B B are mounted in bearings in these fame-peces,and perform their usual functions of slowly moving forward the log,which is pressed down thereon. The means for holding down the. log andfor supporting it at other points are peculiar, but the feed-rollersthemselves involve no novelty. A3 A3 and A4 A4 are smaller side frames,firmly liXed on the framing A above the feed-rolls, and supportingbetween them stout cylindrical rods, A5, which rods carry the framingsfor the binding-rolls, and allow the latter to be raised and lowered atwill, and, under proper conditions, to be swung around out of the way inorder to allow access to the saws. The binder-rolls are indicated by DD. They are mounted in binder-frames E, which embrace the verticalguide-rods A5, by mea-ns of corresponding hollow cylindrical bearings,which may be opened and closed at will, as indicated by El E2. (See Fig.5.) One-halt' of each bearing is formed in the parts El, which are fixedon the main body of the frame E;

The other haltl is formed in the parts or straps E2, which are securedto the parts El by knuckle-joints e and bolts and keys el e2. (See Figs.3, 4, and 5.) When the mill is in condition for use, all these bearingsare made to einbrace their respective rods A5, and the only motion ofwhich the fra me E is susceptible is a simple rising and sinking,vertically. But when it is desired to get access to the saws, forsharpening'. setting, exchanging, or the like, the frame E and itsconnections are swuu g out ot' the way by disconnecting it from one ofthe vertical rods A5, and causing it to swivel around upon the other. Toet't'ect this operation, the key c2 is driven out ofthe bolt e1 fromboth ot'l the bearings on one side ot' the frame E, and thecorresponding straps E5 are swung open in the position shown in dottedlines in Fig. 5. This liberates the frame. E from its connection to thevertical guide A5 on one side, and allows it to swing around on thesingle vertical guide on the other side, turning on it as a hinge. Tohold it up when in this condition, I secure upon each guide A5 a stoutcollar, A, as shown in Figs. l and 2. One of these collars may besecured at any desired elevation by means of a set-screw, A12, as rep'-resented, and the weight ot' the binder-frame and its contents bears onand is supported -by it as itswings around, after being set tree 'fromthe other guide A5. Over each collar A11 I mount a stout ring or hollowcylinder, of rubber, as indicated by A13. It is of no ei'ect under anyordinary conditions; but when, in consequence of any accident, thebinder-frame is allowed to drop or to descend too rapidly, these springssoften the concussion. To raise and lower the framing E and itsconnections, when in use, I provide a cranked shaft, F, mounted insuit-able bearings therein, and a rope, f, which, as the crank isturned, is thereby unwound from a large drum, G', mounted on a shaft, G,supported in the tixed framework above. The slow turning of this shaft Gby this means winds up larger ropes or chains, g, which run aroundsheaves in the framing E, and hoist or lower the hinding-rolls and theirconnections, as may be required. In practice, the whole or a greaterportion ot' the weight ot' such framing E and its connections is usuallyallowed to bear on the log through the medium ofthe hinder-rolls Dx. Itwill be understood that these ropes are disconnected, or are set tree,by allowing the shalt F to unwind when the frame E is to be swung'around out of the way. There are two ot' these frames E, with thecorresponding binder-roll and pro` visions for hoisting and swingingaround. One acts on the log in front of the saws, and the other in therear of the saws. Both contribute to hold down the log against theconsiderable litting force which is liable to be felt when the sawsrise. The carrying-rolls should be made as light as is consistent withstrength and durability. I prefera construction in which the maincylindrical surface is lap-welded iron tubing, and the ends cast-iron;but this is not absolutely essential. I attach great importance,however, to the arrangement of the bearings in which they are supported,so that they shall hold the log in a slight curve; or, in other words,shall cause each log to bear very lirmly at each end. To edect this, Iadjust the bean ings in a curved line, as shown in Fig. l. The uppersurface of the feed-rolls B B are lower than the upper surfaces of thenearest adjacent carrying-rolls. The neXt carryingrolls proceedingoutward toward the end oi" the log are a little higher, and the next orsucceeding a little higher yet. The arrangement is clearly shown in Fig.l. The curvature. ot' the log should not be carried to such an extent asto prevent the binder-rolls from holding the log firmly down on thefeed-rolls, but only to such an extent as to insure a solid bearing ofthe ends ofthe logs upon the rolls which are under them. Substantiallythe same effect of holding the upper sides of the rolls in suchrelations may be eii'ected by having the rolls of gradually-increasingsize toward each end ot' the series, and placing their bearings inaline; but I prefer rolls of uniform size, as shown. Chains may, ofcourse, be used instead of ropes, to raise the bindent'ra-mes by themeans shown.

lSome of the advantages due to certain featuresof my invention may beseparately enumerated, as follows: First, by reason of the arrangementof the supporting-rolls, so that the feed-rolls at the center are thelowest, or the supporting-rolls held under each end ofthe log are alittle higher, the log is made. to press lnore rmly than usual on therolls which support its ends, and is thereby more firmly held againstdisplacement laterally. The swiveling around ot' the log` is a seriousevil in some sawing, and is always liable to occur, even with the mostnicely-prepared saws and the strongest pressure on the binder-rolls.This arrangement ot' the supporting-rolls aids much to ameliorate theevil, and the logs will feed through my saw-mill in mathematical rig-htlines under reasonably favorable conditions. Second, by reason, ot' mybolts e1 and keys e2 serving, as represented, relatively to the joint orhinge c and straps E2, and cylindrical guides A5 and collar A withadjusting means A, I am enabled to connect and disconnect the trame Eand swing it around very rapidly, at any desired elevation, with littlellabor or skill. Third, by reason ot' my springs A, fitted, as

shown, under the binder-frame E, I diminish the risk of fracture in casethe binder-frames and their connections are allowed to descend toorapidly from any cause.

I claim as my invention- 1. The supporting-rolls, arranged asrepresented, so as to hold the log with a slight ver tical curvature,and adapted to serve rela` tively to the `teedrolls, and binder-rolls,and saws, as herein specified.

2. The movable frames E and their contained mechanism, mounted on thecylindrical gnidebars A5, over the feed-rolls B B, adjacent to the saws,the adjustable collars A and con- {innig-keys A12, and the hinged strapsE2 turning on the joints c, and confined and released to allow theturning ofthe frames E to obtain access to the saws without completeseparation of the straps, all substantially as herein specified.

3. The springs A13, arranged as shown, and adapted to soften the fallofthe binder-frames E, as herein specified.

In testimony whereof I have hereunto set my name in presence ot' twosubscribing witnesses.

SAML. WEYMOUTH.

Witnesses:

J. D. SNYDER, T. U. Roenes.

